CVE-2026-58644CriticalExploitedCISA KEV · due 19 JulRevised 15 Jul
Microsoft SharePoint Remote Code Execution Vulnerability
Listed in the CISA Known Exploited Vulnerabilities catalog
Added 16 Jul 2026 · federal remediation due 19 Jul 2026.
Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.
Assessment
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
- Severity
- Critical
- CVSS base score
- 9.8CVSS:3.1/
AV:N/ AC:L/ PR:N/ UI:N/ S:U/ C:H/ I:H/ A:H/ E:F/ RL:O/ RC:C - Impact
- Remote Code Execution
- EPSS, next 30 days
- 16%Higher than 96.8% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
- Exploitability
- Exploitation detected
- Publicly disclosed
- No
- Customer action
- Required: apply the update
- Component
- Microsoft Office SharePoint
- Weakness
- CWE-502: Deserialization of Untrusted Data
- Issued by
- Microsoft
- Published
- 14 Jul 2026 · July 2026
- Last revised
- 15 Jul 2026Corrected the Exploitability Index, Exploited flag and CVSS vector which was incorrect at the time of publication on 7/14/2026. This is an informational change only.
Updates that fix it
3 KBs| KB | Type | Restart | Applies to | Other CVEs |
|---|---|---|---|---|
| KB5002873 | Security Update | — | Microsoft SharePoint Server Subscription Edition | All CVEs in KB5002873 |
| KB5002874 | Security Update | — | Microsoft SharePoint Server 2019 | All CVEs in KB5002874 |
| KB5002880 | Security Update | — | Microsoft SharePoint Enterprise Server 2016 | All CVEs in KB5002880 |
Affected products
Microsoft Office3 affected products
- Microsoft SharePoint Enterprise Server 2016
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition